Good Read Vicky,...thanks for the link. Lets see what I can do with my system now. Yesterday, discovered a lot of things about Crossfire..went to sleep at 3:30.
My findings are:
1. Metro CF scaling is awesome. With the Highest quality setting along with AAA antialiasing at 1080P in the 1st level, I was getting over 40 FPS.
2. Crysis 2 does not yet have optimized profile for multi-GPU setup for both nVidia and AMD . In my case although both the cards were working, I was getting lower fps (35-40) compared to my single HD 6870 (45 to 52 fps). Setting is Extreme with every thing set to highest, 4X MSAA and 2X Edge Detection AA and 16X AF. I was using the hack to apply those settings.
After some research, I found out that renaming the game to some other name for which CF profiles are there...like Bioshok.exe, Fear.exe or rift.exe...performance increase a little. I got maximum result with Bioshok.exe..almost 55 to 60 fps but lots of issues with the shadow details and shaders were coming. Fear.exe will provide u around 45 to 50 fps.
3. COD Black Ops was giving 105 FPS with 16X AA and 16X AF. The game also looks a lot better.
4. Got one interesting software called Radeonpro. RadeonPro applies user defined profiles upon game start, just define once the desired 3D settings for each game and have all those settings applied every time you play, automatically. Gonna try it today. Check is over here.